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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '721074216e20c35030f7318f6f3f4ec0b0bb1540c738d525893b8abf182ba8b2' 
  AND token = 'R4+WfOnzadiSPhRiq94be2dyytEEYtQwCYPMug5Sn6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}